I think the inherrent problem with central packaged air con in a domestic house is that the central machine must be sized according to the maximun load that will be required on a hot day with multiple occupants. The problem is that you then have to run the same machine even if you just want to cool down a single room when only one person is in the house. There's several tricks they use to alleviate the inefficiency of doing this such as off-loading and using PWM supply for the compressor (invertor) but this only goes some of the way toward making it more efficient during low-load periods and the running cost can still be an eye-opener.
This is why this system works well in commercial buildings where everyone arrives and leaves within a small time window so the air-con needs to run flat out during the day then by switched off. There's very little middle ground where they just need to condition a few of the office spaces because of low occupancy.
Regardless of the advertising bumf on the website, for me the jury is still out on whether this system is the prudent option for a residential property especially at this time when energy efficiency is a big issue from all angles.
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